All you have to do is purchase an upgrade key from Microsoft or another authorized retailer to unlock those shiny new features.
In Windows 7, the software you need comes preinstalled. Upgrading doesn't mean installing new software. That way, you get to take advantage of extra features while keeping your current programs, files, and settings intact. And with Windows Anytime Upgrade, you can upgrade to a more advanced edition of Windows 7 - from: Windows 7 Starter to Windows 7 Home Premium, Professional or Ultimate Windows 7 Home Premium to Windows 7 Professional or Ultimate Windows 7 Professional to Windows 7 Ultimate - in as little as 10 minutes. If you want to upgrade your copy of Windows 7, you can go online and do it in about 10 minutes, right from your PC. With all the exciting entertainment features of Windows Home Premium, it's a great choice for home and for business.
Windows 7 Professional: It adds some features like Remote Desktop Server, Location Aware Printing, Encrypted File System, Display Mode, Software Restriction Policy, etc. You can also connect to company networks effortlessly and more securely with Domain Join. Windows 7 Home Premium: It is the mainstream version, including various Windows Aero features, Windows Media Center, and touch-screen controls. You can run many Windows XP productivity programs in Windows XP Mode and recover data easily with automatic backups to your home or business network. With Windows 7 Professional, fewer walls stand between you and your success.